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Imperial Academy of Sciences, St. Petersburg, Russia
Tissue samples taken by Amanda Haponski for the "Lake Erie Center & Department of Environmental Sciences, University of Toledo" in June 2009.

Imperial Porcelain Manufactory, St. Petersburg · 1755–60
Imperial Academy of Sciences, St. Petersburg, Russia

Imperial Porcelain Manufactory, St. Petersburg · ca. 1780–1800
Imperial Academy of Sciences, St. Petersburg, Russia

Imperial Armory, Tula (south of Moscow), Russia · ca. 1780–85
Imperial Academy of Sciences, St. Petersburg, Russia